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  #11  
Old 2nd May 2012
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It takes a bit longer to pump up if you do not have the throttle opened, but it will not give you a bad reading. Never a good idea to have the choke closed, but I would assume it will still pump up eventually even that way.

Keeping the throttle open is an overstated opinion, but it doesn't hurt.
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  #12  
Old 2nd May 2012
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Hmm so it sounds like that I may have the pushrod adjustment a little on the tight side then. I will check the adjustment on them to make sure then.

Mick, the manual didn't say anything about the throttle being fully opened when doing the test. Should I do it with the throttle fully opened?
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Quote:
Originally Posted by 19sporty75 View Post
Hmm so it sounds like that I may have the pushrod adjustment a little on the tight side then. I will check the adjustment on them to make sure then.

Mick, the manual didn't say anything about the throttle being fully opened when doing the test. Should I do it with the throttle fully opened?
I just addressed that in the last post. Compression testing is not unique to Ironheads. It takes slightly longer for the reading to pump up (you can watch it and count the pumps if you like) if the throttle is not held open, but the reading will be the same regardless. It doesn't hurt to hold it open, but it's in no way essential.

The reason that most people recommend opening the throttle is so that you do not use more of your battery charge than necessary to get the job done. I have been doing compression for over 45 years both ways, and I can tell you from experience that there is no difference in the final numbers.
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Old 2nd May 2012
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Thanks Wedge for clearing that up for me.
So having to tight of a pushrod adjustment will result in a low compression reading?
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Absolutely, yes. It can hold the valve slightly open when it should be closed. I can't see the last page of posts right now, but someone already gave the method of adjusting. You have to make sure that each pushrod is at it's lowest position (lifter on the heel of the cam), then you rotate the pushrod with your fingers. It should rotate freely with no drag, with the engine cold. You should not be able to feel any up and down play. Play with it a bit so that you can feel what too loose feels like, and then what too tight feels like, then put it where it rotates nice and free without play in it.

If you get it to TDC on one jug you can adjust both pushrods, then get the other one at TDC and do those two pushrods.

Also pay attention to how many pumps it takes to pump it up on each cylinder, because if one jug pumps up slow it can show an error, and if one pumps up fast it can also tell you something. Too fast means the exhaust isn't opening (pushrod loose enough to fall out of place, I saw that on a shovelhead which is very similar to the ironhead in the way it is adjusted). Too slow is the usual suspect list.
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Alright, sounds like I have a project for tomorrow night now
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wedge, my experience is with only my 2 IronHeads, but my experience is that not having the throttle open makes a significant difference in the reading; and it seems that other members here have got better readings after following my advice to do it again, throttle open.

Maybe i'll conduct a scientific experiment next time; easy enough. I'll just do it twice on each cylinder, once open, again closed.
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I checked mine earlier today just out of curiosity. 125 front, 150 rear turned out i had a tight intake valve on the front. Both within a couple pound after readjusting.
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Quote:
Originally Posted by wedge View Post
I just addressed that in the last post. Compression testing is not unique to Ironheads. It takes slightly longer for the reading to pump up (you can watch it and count the pumps if you like) if the throttle is not held open, but the reading will be the same regardless. It doesn't hurt to hold it open, but it's in no way essential.

The reason that most people recommend opening the throttle is so that you do not use more of your battery charge than necessary to get the job done. I have been doing compression for over 45 years both ways, and I can tell you from experience that there is no difference in the final numbers.
it's been my experience (which is considerable) that throttle position makes no difference in the final readings...... it may take a pump or 2 more at closed throttle to reach final reading, but it's the same either way

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  #20  
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Mick, you where right about having the throttle fully opened. It seem that i completely read over it when looking over the manual last night.
I'll adjust the pushrods tonight and give an update.
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